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Subject[PACTH v3 3/3] Documentation/filesystems: Added /proc/PID/totmaps documentation
From: Robert Foss <>

Added documentation covering /proc/PID/totmaps.

Signed-off-by: Robert Foss <>
Documentation/filesystems/proc.txt | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 7d001be..c06ff33 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -11,6 +11,7 @@ Version 1.3 Kernel version 2.2.12
Kernel version 2.4.0-test11-pre4
fixes/update part 1.1 Stefani Seibold <> June 9 2009
+add totmaps Robert Foss <> August 12 2016

Table of Contents
@@ -147,6 +148,8 @@ Table 1-1: Process specific entries in /proc
stack Report full stack trace, enable via CONFIG_STACKTRACE
smaps an extension based on maps, showing the memory consumption of
each mapping and flags associated with it
+ totmaps an extenssion based on maps, showing the total memory
+ consumption of all mappings
numa_maps an extension based on maps, showing the memory locality and
binding policy as well as mem usage (in pages) of each mapping.
@@ -512,6 +515,24 @@ be vanished or the reverse -- new added.
This file is only present if the CONFIG_MMU kernel configuration option is

+The /proc/PID/totmaps is an extension based on maps, showing the memory
+consumption totals for all of the process's mappings. It lists the sums of the
+same statistics as /proc/PID/smaps.
+The process' mappings will be summarized as a series of lines like the
+Rss: 4256 kB
+Pss: 1170 kB
+Shared_Clean: 2720 kB
+Shared_Dirty: 1136 kB
+Private_Clean: 0 kB
+Private_Dirty: 400 kB
+Referenced: 4256 kB
+Anonymous: 1536 kB
+AnonHugePages: 0 kB
+Swap: 0 kB
The /proc/PID/clear_refs is used to reset the PG_Referenced and ACCESSED/YOUNG
bits on both physical and virtual pages associated with a process, and the
soft-dirty bit on pte (see Documentation/vm/soft-dirty.txt for details).
 \ /
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